Question

When an alien species (plant or animal) that does not belong to an ecosystem is introduced, it spreads and

competes with the native plants for space and nutrients and becomes problematic in the absence of

natural enemies. These intruders are called invasive alien species.

What are the ill effects of an invasive species like water hyacinth?

i. Blockage of sunlight from reaching native aquatic plants.

ii. Starving the water of carbon dioxide

iii. Domination and phasing out of fish and other native species.

iv. Change in the water quality with respect to the dissolved oxygen and the water pH due to release

of CO2 .

v. Starving the water of oxygen.

vi. Desilting of the water body

vii. An increase in algae blooms, mosquito infestation due to dense matting and decreased water flow. a) i , ii, iii, iv, v

b) i, iii, v, vii, iv

c) iii, v, vi, vii

d) iii, iv, v, vi​

Answer 1

Answer:

Blockage of sunlight from reaching native aquatic plants.

ii. Starving the water of carbon dioxide

iii. Domination and phasing out of fish and other native species.

iv. Change in the water quality with respect to the dissolved oxygen and the water pH due to release of CO2 .

v. Starving the water of oxygen.

the first five options are correct

Explanation:

Answer 2

The correct statement that is involved over here is, I, ii , iii , iv , v

Option a

Explanation:

• The invisible species is one of the reason for decrease in the number of a large number of natural species in a particular habitat. With increase in the number of invasive species there is decrease in the amount of Oxygen and nutrients that is present in a particular medium.
• Invasive species have the capability to reproduce very fast. Hence all the natural species ultimately die due to lack of essential nutrients.

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